Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Anemia:

"
  • Anemia of prematurity, from frequent blood sampling for laboratory testing, combined with insufficient RBC production[citation needed]
  • Trauma[1] or surgery, causing acute blood loss[citation needed]
  • Gastrointestinal tract lesions,[1] causing either acute bleeds (e.g. variceal lesions, peptic ulcers, hemorrhoids[2]) or chronic blood loss (e.g. angiodysplasia)